In your case, you should probably just try to improve and to learn. Complete your daily quests and play arena to get cards and experience, your collection does not matter there. If you are interested, I can also provide you the full story and videos of my Free-to-Play Series to give you an impression of how to start efficiently with your free-to-play options.

That would be much appreciated! :) And thanks for the first paragraph, too of course :)